CN1884940B - Defrosting device for engine driven air conditioner - Google Patents
Defrosting device for engine driven air conditioner Download PDFInfo
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- CN1884940B CN1884940B CN2005100776460A CN200510077646A CN1884940B CN 1884940 B CN1884940 B CN 1884940B CN 2005100776460 A CN2005100776460 A CN 2005100776460A CN 200510077646 A CN200510077646 A CN 200510077646A CN 1884940 B CN1884940 B CN 1884940B
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- cooling water
- heat exchanger
- refrigerant
- premises station
- compressor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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Abstract
The invention relates to a defrost device of air conditioner, driven by engine, wherein said defrost device comprises a heating defrosting cycle system, a cooling water cycle system and a control system; the heating defrosting cycle system via cooling water-coolant heat exchanger is connected to the cooling water cycle system; the heating defrosting cycle system and cooling water cycle system via circuit are connected to the control system. The invention improves the heating defrosting cycle system and the control system, and adds one cooling water cycle system; while it uses cooling water cycle system to utilize the waste heat of engine to defrost and improve defrost efficiency.
Description
Technical field
The present invention is a kind of defroster of air conditioner, particularly a kind of defroster of engine driving type air conditioner machine.
Background technology
Heat-pump air-conditioner is in the process of heating, and when off-premises station heat exchanger coils temperature was lower than the air dew point temperature, its surface produced condensed water, and in a single day condensed water is lower than 0 ℃ just maybe frosting.When frosting was serious, air channel between off-premises station heat exchanger radiating fin was local or all occupied by frost, thereby increased thermal resistance and windage, and this will directly influence its heat exchange efficiency.The frosting phenomenon is inevitable phenomenon in the heat pump heat supply process of heat-pump air-conditioner, and therefore, it is essential that defroster is set in heat-pump air-conditioner.Defroster has reverse cycle defrosting and bypass defrost dual mode usually, and this is explained respectively as follows:
Reverse cycle defrosting switches to refrigerating operaton with kind of refrigeration cycle from heat supply running exactly in heat supply running; Make from the refrigerant gas of the heat of compressor discharge; The flow direction has the off-premises station heat exchanger of frost; Make the frost attached to the off-premises station heat exchanger be able to melt, the weak point of reverse cycle defrosting method is: owing to defrost and heat is to hocket, thereby causes frequent stopping compressor and switch four-way change-over valve; Indoorly in the defrost process do not supply heat, even blow out cold wind; The defrosting holding time is long, and causing during this period, indoor temperature obviously descends; Be changed to when defrosting by heating row, and be changed to when heating by defrosting, each conversion all has the mixing of cold and hot cold-producing medium, thereby causes the loss of energy.
Bypass defrost is when needs defrost, to open by-passing valve; The outer machine heat exchanger of the direct inlet chamber of part high pressure gas is defrosted; Its advantage is to keep indoor a certain amount of heat supply in the defrost process, and shortcoming is: because be the outer machine heat exchanger of part cold-producing medium inlet chamber, heat is limited; Cause defrosting time long, defrosting is slow; Need extra increase pipeline and valve member, not only increase material cost, also will increase the space.
Above-mentioned two kinds of defrosters; The defroster that all belongs to electrically driven (operated) heat-pump air-conditioner, they all are that the system thermal of utilizing the compressor work done to become defrosts, and do not have other heat supplement therebetween; And defrosting is to need great amount of heat, so total effect is poor.The existing now measure that utilizes other heat energy to defrost as adopting electric heating tube, though can improve defrosting effect like this, has increased component costs, also expends many electric energy.
Summary of the invention
Engine driving type air conditioner machine according to the invention is to be the energy with the combustion gas, drives compressor with the gas driven gas engine and heats refrigeration.This air conditioner comprises heat supply defrosting circulating system and control system, and said heat supply defrosting circulating system also is used for defrosting except being used for heat supply.The present invention improves the heat supply defrosting circulating system of air conditioner and control system, and increases by a cooling water recirculation system, to improve its defrost function.
The objective of the invention is to invent a kind of defroster of engine driving type air conditioner machine according to the deficiency of the defroster that has electrically driven (operated) heat-pump air-conditioner now; This device in defrost process except utilizing the system thermal that the compressor work done becomes; Also draw waste heat from the cylinder body of waste heat recoverer and engine; As the additional heat of defrosting, so improved the effect of defrosting greatly.Owing to made full use of waste heat during defrosting; Just can from the system thermal that compressor becomes when the work done, only take out a part and be used for defrosting; Another part heat then is used for indoor heating; So in defrosting, can also keep a certain amount of indoor heating, make the indoor tangible temperature decline that do not have, overcome the sometimes hot and sometimes cold phenomenon that traditional electrically driven (operated) heat-pump air-conditioner is had when defrosting; Also need not increase simultaneously other the components and parts that are used for additional heat, reduce the cost of equipment.
The present invention realizes as follows:
The defroster of engine driving type air conditioner machine of the present invention comprises a heat supply defrosting circulating system, a cooling water recirculation system and a control system; The heat supply defrosting circulating system links to each other with cooling water recirculation system through cooling water-refrigerant heat exchanger, and the heat supply defrosting circulating system links to each other with the control system through circuit with cooling water recirculation system.
Said heat supply defrosting circulating system is by compressor, four-way change-over valve, indoor set heat exchanger, indoor set expansion valve, off-premises station expansion valve; Off-premises station heat exchanger, cooling water-refrigerant heat exchanger, four-way change-over valve, compressor are formed by connecting through pipeline; The outside at the indoor set heat exchanger is provided with indoor machine fan, is provided with outdoor machine fan in the outside of off-premises station heat exchanger.
Said cooling water recirculation system is to be formed by connecting through pipeline on water pump, waste heat recoverer, engine, cooling water stop valve, cooling water-refrigerant heat exchanger, water pump; In this cooling water recirculation system, be provided with two branch roads that are in parallel with cooling water-refrigerant heat exchanger: this branch road one is to be formed by cooling water stop valve and radiator tandem; The 2nd, directly constitute by the cooling water stop valve.
Said control system is made up of a plurality of sensors and control centre, and its sensor is: on the off-premises station heat exchanger, be provided with the coil temperature sensor that is used for machine heat exchanger coil temperature outside the sensing chamber; Be provided with the temperature sensor that is used to detect outdoor environment temperature in off-premises station heat exchanger outside; Be provided for detecting the cooling-water temperature sensor of cooling water temperature at the engine export place; On the pipeline between compressor and the four-way change-over valve, be provided with and be used to detect high-pressure sensor from the high pressure-temperature gas pressure of compressor discharge; The above sensor links to each other with control centre through circuit; In addition, the outdoor machine fan in the said heat supply defrosting circulating system, indoor machine fan, indoor set expansion valve, off-premises station expansion valve, and the cooling water stop valve in the cooling water recirculation system also is connected with control centre through circuit.In the course of work of heat supply defrosting circulating system, the detected temperature of environment temperature sensor is t
1, the detected temperature of coil temperature sensor is t
2, the detected temperature of cooling-water temperature sensor is t
3, the detected pressure of high-pressure sensor is P, works as t
1, t
2, t
3, when P and running time T satisfy regulation and require (this requirement is artificially set in control centre), just carry out heat supply running or carry out Defrost operation.
Because the present invention increases by a cooling water recirculation system; The used heat that this cooling water recirculation system utilizes engine to produce; And pass through cooling water-refrigerant heat exchanger the circulatory mediator in the heat supply defrosting circulating system is heated; To improve the temperature of this circulatory mediator, accelerate circulation rate, so improved defrosting efficiency greatly.
Description of drawings
Fig. 1 is a structure chart of the present invention
Among the figure: 1 compressor, 2 four-way change-over valves
3 indoor set heat exchangers, 4 indoor set expansion valves
5 off-premises station expansion valves, 6 off-premises station heat exchangers
7 cooling waters-refrigerant heat exchanger 8 indoor machine fans
9 outdoor machine fans, 10 water pumps
11 waste heat recoverers, 12 engines
13a cooling water stop valve 13b cooling water stop valve
13c cooling water stop valve 14 radiators
15 coil temperature sensors, 16 environment temperature sensors
17 cooling-water temperature sensors, 18 high-pressure sensors.
The specific embodiment
As shown in Figure 1, the defroster of engine driving type air conditioner machine of the present invention comprises a heat supply defrosting circulating system, a cooling water recirculation system and a control system; The heat supply defrosting circulating system links to each other with cooling water recirculation system through cooling water-refrigerant heat exchanger 7, and the heat supply defrosting circulating system links to each other with the control system through circuit with cooling water recirculation system.
Said heat supply defrosting circulating system is by compressor 1, four-way change-over valve 2, indoor set heat exchanger 3, indoor set expansion valve 4, off-premises station expansion valve 5; Off-premises station heat exchanger 6, cooling water-refrigerant heat exchanger 7, four-way change-over valve 2, compressor 1 are formed by connecting through pipeline; Be provided with indoor machine fan 8 in the outside of indoor set heat exchanger 3, be provided with outdoor machine fan 9 in the outside of off-premises station heat exchanger 6.
Said cooling water recirculation system is to be formed by connecting through pipeline on water pump 10, waste heat recoverer 11, engine 12, cooling water stop valve 13a, cooling water-refrigerant heat exchanger 7, water pump 10; In native system, also be provided with two branch roads that are in parallel with cooling water-refrigerant heat exchanger 7: the one, be in series by cooling water stop valve 13b and radiator 14; The 2nd, directly constitute by cooling water stop valve 13c.
Said control system is made up of a plurality of sensors and control centre, and its sensor is: on off-premises station heat exchanger 6, be provided with the coil temperature sensor 15 that is used for machine heat exchanger 6 coil temperatures outside the sensing chamber; Be provided with the temperature sensor 16 that is used to detect outdoor environment temperature in off-premises station heat exchanger 6 outsides; Be provided for detecting the cooling-water temperature sensor 17 of cooling water temperature in engine 12 exits; On the pipeline between compressor 1 and the four-way change-over valve 2, be provided with and be used to detect high-pressure sensor 18 from the high pressure-temperature gas pressure of compressor 1 discharge; The above sensor links to each other with control centre through circuit; In addition, the outdoor machine fan 9 in the said heat supply defrosting circulating system, indoor machine fan 8, indoor set expansion valve 4, off-premises station expansion valve 5, and the cooling water stop valve 13a in the cooling water recirculation system, 13b, 13c also are connected with control centre through circuit.In the course of work of heat supply defrosting circulating system, environment temperature sensor 16 detected temperature are t
1, coil temperature sensor 15 detected temperature are t
2, cooling-water temperature sensor 17 detected temperature are t
3, high-pressure sensor 18 detected pressure are P, work as t
1, t
2, t
3, when P and running time T meet certain requirements (this requirement is artificially set in control centre), just carry out heat supply running; Work as t
1, t
2, t
3, when P and running time T satisfy another requirement (this another require also artificially to set in control centre), just carry out Defrost operation.
Defrost operation is after the heat supply defrosting circulating system is received the defrosting order of control centre, to begin to carry out, and under the control of control centre, will close outdoor machine fan 6; Reach maximum position to indoor set expansion valve 4 and off-premises station expansion valve 5; Engine 12 reaches maximum speed; Owing to still will close or little rotating speed state so indoor machine fan 8 is in during Defrost operation to indoor heating; Cooling water in the cooling water recirculation system then only flows to cooling water-refrigerant heat exchanger 7.The detailed process of Defrost operation is as shown in Figure 1: compressor 1 is discharged the high pressure-temperature gas refrigerant through four-way change-over valve 2, through connecting machine heat exchanger 3 in the pipeline inlet chamber, because indoor machine fan 8 is in and closes once in a while or little rotating speed state; And indoor set expansion valve 4 reaches maximum; So gaseous refrigerant not liquefaction arrives off-premises station expansion valve 5 just through indoor set expansion valve 4 through tube connector, because off-premises station expansion valve 5 reaches maximum; The outer machine heat exchanger 6 of the gaseous refrigerant inlet chamber of heat; Thawing is attached to the frost on off-premises station heat exchanger fin surface, and cold-producing medium liquefies off-premises station heat exchanger 6 in, its liquid refrigerant entering cooling water-refrigerant heat exchanger 7 water heating evaporation that is cooled; Its gaseous refrigerant returns compressor 1 through four-way change-over valve 2, accomplishes a cycle.This cycle is to utilize the part of the system thermal that compressor 1 work done becomes to defrost, and the present invention further also will assist defrosting through the used heat that cooling water recirculation system utilizes engine 12 to be produced, and its running is following: cooling water absorbs heat from the cylinder body of waste heat recoverer 11 and engine 12; The temperature of cooling water is raise, and when needs defrosted, cooling water stop valve 13a was opened; Cooling water stop valve 13b, 13c then are closed; So cooling water will only flow to cooling water-refrigerant heat exchanger 7, because the temperature of this cooling water is higher, so; Heated the cold-producing medium of liquefaction in off-premises station heat exchanger 6; Cold-producing medium also can be kept not low pressure because of the vaporization of being heated, and the gaseous refrigerant that such temperature, pressure is not low forms high temperature and high pressure gas after compressor 1 compression, and circulation constantly.In Defrost operation, off-premises station heat exchanger coils temperature t
2To raise gradually, work as t
2When being raised to certain value, will finishing Defrost operation and get into heat supply running.
During heat supply running; Compressor 1 is discharged the high pressure-temperature gas refrigerant through four-way change-over valve 2, through connecting machine heat exchanger 3 in the pipeline inlet chamber, through indoor machine fan 8 to indoor heat radiation; Cold-producing medium liquefies in indoor set heat exchanger 3; Flow through indoor set expansion valve 4 of liquid refrigerant arrives off-premises station expansion valve 5 with tube connector, and through after 5 throttlings of off-premises station expansion valve (aperture is not a maximum position), high pressure liquid refrigerant becomes the gas-liquid mixed state of low-pressure low-temperature; The outer machine heat exchanger 6 heat absorption evaporations of the cold-producing medium inlet chamber of low-pressure low-temperature; The heat that outdoor machine fan 9 air-supply provides evaporation to need, the cold-producing medium of evaporation does not get into cooling water-refrigerant heat exchanger 7 water heating evaporation that is cooled fully, and gaseous refrigerant returns compressor 1 through four-way change-over valve 2.
In Defrost operation, control centre will control the different rotating speeds of indoor machine fan 8 according to the force value p that high-pressure sensor 18 is detected, and balance is used for indoor to the relation of heating load with the heat that is used to defrost.
Cooling water stop valve 13a opens in Defrost operation, 13b closes and 13c closes.In other ruuning situation, the switching of cooling water stop valve 13a, 13b and 13c is by cooling-water temperature sensor 17 detected temperature t
3Control, when t3＞90 ℃, 13a closes, 13b opens, 13c closes; When 45 ℃＜t3≤90 ℃, 13a opens, 13b closes, 13c closes; When t3≤45 ℃, 13a closes, 13b closes, 13c opens.
Claims (5)
1. the defroster of an engine driving type air conditioner machine, it is characterized in that: it comprises a heat supply defrosting circulating system, a cooling water recirculation system and a control system; The heat supply defrosting circulating system links to each other with cooling water recirculation system through cooling water-refrigerant heat exchanger, and the heat supply defrosting circulating system links to each other with the control system through circuit with cooling water recirculation system;
Described heat supply defrosting circulating system is to be formed by connecting through pipeline on compressor, four-way change-over valve, indoor set heat exchanger, indoor set expansion valve, off-premises station expansion valve, off-premises station heat exchanger, cooling water-refrigerant heat exchanger, four-way change-over valve, compressor; The outside at the indoor set heat exchanger is provided with indoor machine fan, is provided with outdoor machine fan in the outside of off-premises station heat exchanger; When needs defrost; Compressor is discharged the high pressure-temperature gaseous refrigerant; Make the high-temperature gas cold-producing medium not arrive the off-premises station expansion valve through the indoor set expansion valve before the liquefaction; The outer machine heat exchanger of inlet chamber, the liquid refrigerant after the defrosting get into cooling water-refrigerant heat exchanger water heating evaporation that is cooled, and return compressor through four-way change-over valve;
Said cooling water recirculation system is to be formed by connecting through pipeline on water pump, waste heat recoverer, engine, cooling water stop valve, cooling water-refrigerant heat exchanger, water pump; Said cooling water recirculation system is absorbed heat the cylinder body of cooling water from waste heat recoverer and engine; The temperature of cooling water is raise; When needs defrost, open the first cooling water stop valve, close the second cooling water stop valve and the 3rd cooling water stop valve; Make cooling water only flow to liquid refrigerant in cooling water-refrigerant heat exchanger and the outer machine heat exchanger of heating clamber, make the liquid refrigerant vaporization form gaseous refrigerant and get into compressor.
2. the defroster of said engine driving type air conditioner machine according to claim 1 is characterized in that: in said cooling water recirculation system, the branch road and the cooling water-refrigerant heat exchanger that are provided with by cooling water stop valve and radiator tandem are in parallel.
3. the defroster of said engine driving type air conditioner machine according to claim 1 is characterized in that: in said cooling water recirculation system, be provided with the branch road and the cooling water-refrigerant heat exchanger that are made up of the cooling water stop valve and be in parallel.
4. the defroster of said engine driving type air conditioner machine according to claim 1; It is characterized in that: said control system is made up of a plurality of sensors and control centre, and its sensor is: on the off-premises station heat exchanger, be provided with the coil temperature sensor that is used for machine heat exchanger coil temperature outside the sensing chamber; Be provided with the temperature sensor that is used to detect outdoor environment temperature in off-premises station heat exchanger outside; Be provided for detecting the cooling-water temperature sensor of cooling water temperature at the engine export place; On the pipeline between compressor and the four-way change-over valve, be provided with and be used to detect high-pressure sensor from the high pressure-temperature gas pressure of compressor discharge; The above sensor links to each other with control centre through circuit.
5. the defroster of said engine driving type air conditioner machine according to claim 1; It is characterized in that: the outdoor machine fan in the said heat supply defrosting circulating system, indoor machine fan, indoor set expansion valve, off-premises station expansion valve, and the cooling water stop valve in the cooling water recirculation system is connected with control centre through circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100776460A CN1884940B (en) | 2005-06-22 | 2005-06-22 | Defrosting device for engine driven air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100776460A CN1884940B (en) | 2005-06-22 | 2005-06-22 | Defrosting device for engine driven air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1884940A CN1884940A (en) | 2006-12-27 |
| CN1884940B true CN1884940B (en) | 2012-02-29 |
Family
ID=37583218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100776460A Expired - Fee Related CN1884940B (en) | 2005-06-22 | 2005-06-22 | Defrosting device for engine driven air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1884940B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11833889B2 (en) | 2018-09-13 | 2023-12-05 | Carrier Corporation | Transport refrigeration unit with engine heat for defrosting |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699196B (en) * | 2009-10-28 | 2012-08-08 | 华南理工大学 | Air-cooling heat pump using excess heat of compressor for frost prevention |
| ITUB20153364A1 (en) * | 2015-09-03 | 2017-03-03 | Begafrost S R L | DEFROSTING SYSTEM FOR EXTERNAL EVAPORATOR IN A HEAT PUMP SYSTEM. |
| CN109990499B (en) * | 2019-03-04 | 2021-02-19 | 南京天加环境科技有限公司 | Gas heat pump air conditioning system without shutdown during defrosting |
| CN115371155A (en) * | 2022-08-30 | 2022-11-22 | 南京天加环境科技有限公司 | Gas heat pump air conditioning system capable of quickly defrosting and control method thereof |
-
2005
- 2005-06-22 CN CN2005100776460A patent/CN1884940B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11833889B2 (en) | 2018-09-13 | 2023-12-05 | Carrier Corporation | Transport refrigeration unit with engine heat for defrosting |
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| Publication number | Publication date |
|---|---|
| CN1884940A (en) | 2006-12-27 |
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Granted publication date: 20120229 Termination date: 20160622 |
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